@gabriel_tan can you please describe what device you are running Windows 10 on? This issue is troubling, we can not reproduce it anywhere. We saw it once on @DBrown 's machine and it was fixed by applying missed updates. That is obviously not helping in your case.

From the fact that app do not relocate lock to the center when you resize window I can tell that app is dead and not doing anything. Do you observe any CPU or RAM consumption in Task Manager? Or network/disk activity? Do you have any antimalware/antivirus running?

I'm running the app on a Surface Pro 3, and I have tried uninstalling and reinstalling the app via Windows Store. I'll get back to you regarding CPU usage and task manager. I do not have any antimalware or antivirus running.

@marksmyth can you please also check that latest updates are installed on the machine? We've seen few cases of app misbehaving like that and it always came down to missed updates of Windows itself. Thanks, Sergey